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Author: AckermannTM

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+	<runtime>
+		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+			<probing privatePath="x86"/>
+		</assemblyBinding>
+	</runtime>
+</configuration>

Form1.Designer.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using CefSharp;
+using CefSharp.WinForms;
+
+namespace Jstris_Client
+{
+    public partial class Jstris : Form
+    {
+        public ChromiumWebBrowser browser;
+        public Jstris()
+        {
+            InitializeComponent();
+            this.FormBorderStyle = FormBorderStyle.Sizable;
+            this.WindowState = FormWindowState.Maximized;
+            InitializeChromium();
+
+        }
+
+        public void InitializeChromium()
+        {
+            CefSettings settings = new CefSettings();
+            settings.CachePath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + @"\CEF";
+            Cef.Initialize(settings);
+            browser = new ChromiumWebBrowser("https://jstris.jezevec10.com");
+            browser.KeyboardHandler = new KeyboardHandler();
+            this.Controls.Add(browser);
+            browser.Dock = DockStyle.Fill;
+
+        }
+
+        private void Jstris_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.KeyCode == Keys.Escape)
+            {
+                MessageBox.Show("SheesH");
+            }
+        }
+    }
+
+
+    //KeyboardHandler by tobre => https://stackoverflow.com/questions/60740328/keyboard-shortcut-does-not-make-it-to-cefsharp-browser-control
+    public class KeyboardHandler : IKeyboardHandler
+    {
+        private bool _cefAltKeyPressed;
+        public bool OnPreKeyEvent(IWebBrowser chromiumWebBrowser, IBrowser browser, KeyType type, int windowsKeyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey, ref bool isKeyboardShortcut)
+        {
+            return false;
+        }
+
+        public bool OnKeyEvent(IWebBrowser chromiumWebBrowser, IBrowser browser, KeyType type, int windowsKeyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey)
+        {
+            if (windowsKeyCode == 18)
+            {
+                _cefAltKeyPressed = true;
+            }
+            const int KEY_F4 = 115;
+            //Console.WriteLine("Key Pressed " + windowsKeyCode); .> To Debug and analyse other Shortcut Combinations
+            if (_cefAltKeyPressed)
+            {
+                if (windowsKeyCode == KEY_F4)
+                {
+
+                    Application.Exit();
+                }
+                
+                _cefAltKeyPressed = false;
+
+            }
+            return true;
+        }
+    }
+}